The unidentified man was indicted by a five-judge panel in Bern-Mitelland regional court on charges of intentionally spreading human disease and causing serious bodily harm, offenses that carry maximum penalties of five to 10 years respectively, said the regional prosecutor's office in Bern, the Swiss capital.

The office said in a statement that most of the victims attended a music school that the man operated.

A spokesman for the prosecutor, Christof Scheurer, said the man also practiced as an unlicensed, self-styled acupuncturist -- a trade which he is believed to have used between 2001 and 2005 as a pretext to prick and infect some of his victims with blood that was infected with AIDS.

HIV is transmitted through bodily fluids such as blood, semen or breast milk. According to international AIDS and HIV organization Avert, about 34 million people worldwide were living with HIV or AIDS as of 2010, 2.7 million of which were newly infected that year. Deaths attributed to the AIDS virus in 2010 totaled 18 million.

The police investigation concluded that the man had used various pretexts to prick his victims, but it remained unclear exactly what objects he had used. In other cases, the investigation found, the self-described healer -- who is not HIV-positive -- had served his victims drinks that made them pass out so he could infect them.

"The defendant denies everything that is alleged," the prosecutor's statement added.

The cases apparently came to light when Bern hospital Inselspital began to investigate similar complaints of infections in connection with a so-called healer.

Prosecutors say the probe, which was launched after one alleged victim filed a criminal complaint in early 2005, has finally been completed, but that it took years because of a number of difficulties ranging from the use of genetic testing to identifying victims while adhering to protections for patient privacy.

Proceedings against a second suspect in the case have been permanently closed, the statement said, because his involvement could not be confirmed.